AutoCodes – Generic – B051B

B051B Code - Right Side Assist Step Motor Control Circuit

Quick Answer

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Common causes include Faulty Right Side Assist Step Motor, Right Side Assist Step Motor harness is open or shorted, Right Side Assist Step Motor circuit poor electrical connection. Severity is Low - monitor the vehicle and repair when practical. The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

What it means: B051B indicates Right Side Assist Step Motor Control Circuit.
Common causes: Common causes include Faulty Right Side Assist Step Motor, Right Side Assist Step Motor harness is open or shorted, Right Side Assist Step Motor circuit poor electrical connection.
Severity: Low - monitor the vehicle and repair when practical.
Can I drive?: The vehicle can usually be driven if no severe symptoms are present, but symptoms should be checked before extended driving.

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Code Popularity 1,988

How popular is this code, among other codes? Low

Repair Importance Level

Low (Monitor) (1 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 13, 2022

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code B051B Description

The Assist Step Control (ASC) Module controls the running board actuators to extend or retract the running boards. Each actuator consists of an electric motor and a potentiometer. The module supplies a low reference and 10-volt reference source voltage to the potentiometer. The ASC control module monitors the voltage drop across the potentiometer on the position signal circuit. When the actuator shaft rotates, the voltage on the position signal circuit changes. The ASC control module supplies the actuator motor with a 12-volt control circuit and a ground control circuit. The ASC module controls the direction of the actuator by changing the polarity of the control circuits.

OBDII Code B051B - Right Side Assist Step Motor Control Circuit - AutoCodes.com — B051B Code - Right Side Assist Step Motor Control Circuit

What does this mean?

What are the Possible Causes of the DTC B051B?

Faulty Right Side Assist Step Motor
Right Side Assist Step Motor harness is open or shorted
Right Side Assist Step Motor circuit poor electrical connection
Faulty Assist Step Control (ASC) Module

How to Fix the DTC B051B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

B051B:0B Right Side Assist Step Motor Control Circuit Current Above Threshold
B051B:01 Right Side Assist Step Motor Control Circuit Short to Battery
B051B:02 Right Side Assist Step Motor Control Circuit Short to Ground
B051B:04 Right Side Assist Step Motor Control Circuit Open Circuit

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the B051B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the B051B code?

Need more information on how to fix the B051B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the B051B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

B051B Buick — Right Side Assist Step Motor Control Circuit
B051B Cadillac — Right Side Assist Step Motor Control Circuit
B051B Chevrolet — Right Side Assist Step Motor Control Circuit
B051B GMC — Right Side Assist Step Motor Control Circuit

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about B051B Code

1. What are the common symptoms of OBDII code B051B?

The common symptoms of OBDII code B051B include issues with the right side assist step motor control circuit, such as malfunctioning or inoperative power running boards on the right side of the vehicle.

2. What causes the OBDII code B051B to trigger?

The OBDII code B051B typically triggers due to a fault in the right side assist step motor control circuit, which can be caused by damaged wiring, a faulty motor, or a malfunctioning control module.

3. How can I diagnose the OBDII code B051B?

Diagnosis of OBDII code B051B involves using a scan tool to retrieve the specific fault code and then inspecting the wiring, connectors, and components related to the right side assist step motor control circuit for any visible damage or issues.

4. Can I still drive my vehicle with the OBDII code B051B present?

It is generally safe to drive your vehicle with the OBDII code B051B present, but it is recommended to address the underlying issue promptly to ensure the proper functioning of the right side assist step motor control circuit.

5. How can I repair the OBDII code B051B?

Repairing OBDII code B051B involves identifying and addressing the root cause of the issue, which may include repairing or replacing damaged wiring, replacing a faulty motor, or reprogramming the control module if necessary.

6. Are there any DIY tips for fixing the OBDII code B051B?

While some basic troubleshooting steps can be performed by DIY enthusiasts, diagnosing and repairing the OBDII code B051B may require specialized tools and expertise, so it is recommended to consult a professional mechanic for proper diagnosis and repair.

7. Will resetting the OBDII code B051B make it go away permanently?

Resetting the OBDII code B051B may temporarily clear the code, but if the underlying issue in the right side assist step motor control circuit is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair the OBDII code B051B?

The cost of repairing OBDII code B051B can vary depending on the specific cause of the issue, the extent of the damage, and the labor rates in your area. It is advisable to obtain quotes from different mechanics or repair shops for an accurate estimate.

9. Can extreme weather conditions affect the right side assist step motor control circuit and trigger the OBDII code B051B?

Extreme weather conditions such as exposure to moisture, salt, or extreme temperatures can potentially damage the wiring or components of the right side assist step motor control circuit, leading to the triggering of OBDII code B051B.

10. Is the OBDII code B051B specific to certain vehicle makes and models?

OBDII code B051B related to the right side assist step motor control circuit can be specific to certain vehicle makes and models that are equipped with power running boards or similar assistive mechanisms on the right side. It is important to consult the vehicle's service manual for specific information.